Regensburg 2019 – wissenschaftliches Programm
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MM: Fachverband Metall- und Materialphysik
MM 12: Poster session I
MM 12.2: Poster
Montag, 1. April 2019, 19:15–20:45, Poster C
Chemical bonding effects on the brittle-to-ductile transition in metallic glasses — •Franco Moitzi1, Daniel Sopu1,2, and Jürgen Eckert1,3 — 1Erich Schmid Institute of Materials Science, Austrian Academy of Sciences, Jahnstrasse 12, 8700 Leoben, Austria — 2Institut für Materialwissenschaft, Technische Universität Darmstadt, Otto-Berndt-Straße 3, 64287 Darmstadt, Germany — 3Department Materials Physics, Montanuniversität Leoben, Jahnstraße 12, 8700, Leoben, Austria
By using molecular dynamics simulations we investigate the influences of composition and temperature on tensile deformation behavior of amorphous PdSi and CuZr alloys. While the plastic deformation in CuZr metallic glass occurs highly localized in one mature shear band, PdSi glass shows brittle cracking perpendicular to the loading direction. The crystal orbital hamilton population analysis based on electronic structure calculation from electronic structure calculation has revealed that the difference in the chemical bonding is responsible for the observed different deformation behaviors. The rigidity of the bonding impedes the strain and stress redistribution in PdSi metal-metalloid glasses and leads the brittle failure. Moreover, a brittle-to-ductile transition can be achieved upon increasing the temperature or/and decreasing the amount of silicon. The prevention of stress accumulation due to stress redistribution is identified to be the reason for the observed transition.